Usages of zuótiān
我们 今天 比 昨天 忙。wǒmen jīntiān bǐ zuótiān máng.
We are busier today than yesterday.
昨天 我 跟 她 说 我 不 能 去。zuótiān wǒ gēn tā shuō wǒ bù néng qù.
Yesterday I told her I couldn’t go.
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